Create teams of 4. Half of the team does the Zombie WOD, the other half does the Defender WOD, then they switch. At the conclusion, all 4 team members should have done both WODS. Both WODS are done for time, and then added together. Shortest time wins. All exercises in both WODS are done with one partner working as long as they can, while the other rests, in succession, until they get each task accomplished.